qcacld-3.0: Remove redefinition of wmi_unified_t

typedef wmi_unified_t is redefined in
qcacld-3.0/core/dp/ol/inc/ol_defines.h previous definition is here
qca-wifi-host-cmn/wmi/inc/wmi_unified_param.h, remove redefinition.

Change-Id: I2c2af59d8b24360cd09efeb12ea19c0340771bb8
CRs-Fixed: 2216859

core/dp/ol/inc/ol_defines.h

@@ -31,14 +31,6 @@
 #ifndef _DEV_OL_DEFINES_H
 #define _DEV_OL_DEFINES_H
 
-/**
- * @brief Opaque handle of wmi structure
- */
-struct wmi_unified;
-typedef struct wmi_unified *wmi_unified_t;
-
-typedef void *ol_scn_t;
-
  /**
   * ol_txrx_pdev_handle - opaque handle for txrx physical device
   * object